doc: correct traceQL metrics documentation #9509

Job	Run time
Run integration tests (test-e2e)	20m 55s
Lint	3m 19s
Run integration tests (test-integration-poller)	10m 9s
Run integration tests (test-e2e-deployments)	13m 22s
Run Unit Tests (test-with-cover-pkg)	3m 12s
Run Unit Tests (test-with-cover-tempodb)	15m 39s
Run Unit Tests (test-with-cover-tempodb-wal)	11m 25s
Run integration tests (test-e2e-serverless)	7m 6s
Run Unit Tests (test-with-cover-others)	12m 23s
Benchmark	9m 32s
Build	1m 53s
Build technical documentation	19s
Check jsonnet & tempo-mixin	52s
Vendor check	1m 28s
	1h 51m 34s

Provide feedback